feat: complete newspaperui component library with docs site

- 18 React components (Layout/Section/Article/Layer/Masthead/Rule +
  Headline/Subhead/Kicker/BodyText/Quote/Byline/Dateline/Caption +
  Image/Figure/Video/PullQuote)
- Theme: warm off-white palette, Source Serif 4 / Cormorant Garamond /
  Inter / Noto Serif SC/JP, visual weight mapping, dark mode
- Docs: Landing page, 6 Blocks (zh/en/jp), component API docs
- GitHub Pages deployment via static export

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

packages/docs/app/(docs)/layout.tsx

@@ -2,7 +2,7 @@ import { Sidebar } from '../../components/Sidebar';
 
 export default function DocsLayout({ children }: { children: React.ReactNode }) {
   return (
-    <div style={{ display: 'flex', minHeight: '100vh' }}>
+    <div style={{ display: 'flex', minHeight: 'calc(100vh - 65px)' }}>
       <Sidebar />
       <main
         style={{